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Exam 32: An Introduction to Animals

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Question 1

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Limbs-especially jointed limbs-are an important evolutionary development because they allow animals to

A) inhabit aquatic environments.
B) develop an endoskeleton.
C) move quickly and precisely.
D) undergo complete metamorphosis.
E) have young disperse from sessile adults.

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Question 2

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Figure 32.4 -Dll is a gene known to direct limb development in the fruit fly.Researchers studying this gene have found that it is also expressed in developing appendages in animals from many other phyla as well,supporting the hypothesis that all animal appendages may be homologous.However,suppose researchers looking at Dll activity had instead found the results shown in Figure 32.4. What would these results suggest?

A) Dll is not actually involved in appendage development.
B) Appendages evolved separately in protostomes and deuterostomes.
C) Appendages coevolved with segmentation.
D) All animal appendages are homologous.

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Question 3

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Which of the following groups of terms best describes the acoelomorpha?

Comb jellies may not be the most familiar animal to you,but they are critical in the food chain because they make up a significant portion of the planktonic biomass.Their feeding strategy is predatory and involves adhesives or mucous on their tentacles or other body parts.What feeding tactic do these animals use?

Figure 32.1 -From the information provided in the figure above,how would you classify the feeding strategy of organism C?

The embryo doesn't grow larger during the stage known as cleavage.What is going on in the embryo during this process?

Which of the following feeding tactics is consistent with this list of features: two-part stomach capable of breaking down tough food particles;simple mouthparts;the ability to burrow through,and consume,indigestible fecal material to get to hidden food?

To reproduce,many plants produce seeds-structures containing embryonic offspring along with nutrients inside a tough case.These offspring develop after being released by the parent plant.To which animal reproductive strategy is seed production most comparable?

The text describes four ways,or tactics,of feeding.Which of the following is NOT one of those ways?

All of the following are true about choanoflagellates EXCEPT

Which of the following characteristics is not true of animals?

Which of the following combinations of embryonic features is common in the deuterostomes?

Parasitism is one of the most successful life strategies ever to evolve.Which of the following is consistent with this finding?

Which one of the following objects most closely resembles the pattern of the tube-within-a-tube body plan?

Why are healthy corals brightly colored?

Figure 32.2 -Which morphological trait evolved more than once in animals,according to the phylogeny based on DNA sequence data found in Figure 32.2 above?

Suppose you came across a novel organism you suspected belonged to one of the following animal phyla: Porifera,Cnidaria,Ctenophora,or Acoelomorpha.Which of the following characteristics would not be helpful in placing the organism into the correct phylum?

While looking at some seawater through your microscope,you spot the egg of an unknown animal.Which of the following tests could you not use to determine whether the developing organism is a protostome or a deuterostome?

Due to its unusual habitat (inside the digestive tracts of other animals) ,the tapeworm lacks

Suppose all of the suspension feeders were removed from a lake.What would you expect to happen after a brief period of time?